Comparative atmospheric corrosion of primary and cold rolled copper in Australia

Atmospheric corrosion tests, according to ASTM G50, have been carried out in Queensland, Australia, at three different sites representing three different environmental conditions. A range of materials including primary copper (electrosheet) and electrolytic tough pitch (traditional cold rolled) copp...

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Bibliographic Details
Published in:Journal of materials science 2003-03, Vol.38 (5), p.995-1005
Main Authors: NAIRN, J. D, SKENNERTON, S. G, ATRENS, A
Format: Article
Language:English
Subjects:
Applied sciences
Atmospheric corrosion
Atmospheric corrosion tests
Cold rolling
Copper
Corrosion
Corrosion environments
Corrosion mechanisms
Corrosion products
Corrosion rate
Corrosion tests
Crystallography
Exact sciences and technology
Exposure
Materials science
Metals. Metallurgy
Morphology
Oxidation rate
Patina
Surface layers
Surface roughness
Texture
X-ray diffraction
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Summary:Atmospheric corrosion tests, according to ASTM G50, have been carried out in Queensland, Australia, at three different sites representing three different environmental conditions. A range of materials including primary copper (electrosheet) and electrolytic tough pitch (traditional cold rolled) copper have been exposed. Data is available for five exposure periods over a three year time span. X-Ray Diffraction has been used to determine the composition of the corrosion products. Corrosion rates have been determined for each material at each of the exposure sites and are compared with corrosion rates obtained from other long term atmospheric corrosion test programs. Primary copper sheet (electrosheet) behaves like traditionally produced cold rolled copper (C11000) sheet but with an increased corrosion rate. This difference between the rolled copper samples and the primary copper samples is probably due to a combination of factors related to the difference in crystallographic texture of the underlying copper, the morphology and texture of the cuprite layer, the surface roughness of the sheets, and the differences in mass. These factors combine together to provide an increased oxidation rate and TOW for the electrosheet material and which is significantly higher at the more “tropical” sites. For a sulfate environment (Urban) the initial corrosion product is cuprite with posnjakite and brochantite also occurring at longer exposures. Posnjakite is either “washed away” or converted to brochantite during further exposure. The amount of brochantite increases with exposure time and forms the blue-green patina layer. For a chloride environment (Marine) the initial corrosion product is cuprite with atacamite also occurring at longer exposures.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1022337511592